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OC4 P1 LC2.3a Airy Wave

The vertical force at the mudline predicted by Flexcom shows good agreement with the other software tools. As outlined in OC4 P1 LC2.1, the project participants which omitted the buoyancy force at the mudline predict a mean vertical force at about -16600 kN, while others (including Flexcom) which included this term predict a mean vertical force of about -15800 kN. According to Popko et al. (2012), differences in peak-to-peak amplitude of vertical force are mainly due to the buoyancy calculation method, whether displaced volume or pressure integration. Additionally, different masses for the jacket substructure and marine growth contributed to discrepancies.

 

Very close agreement is shown between all software tools for the fore-aft shear force at the base of the jacket. Popko et al. mention that minor discrepancies in peak-to-peak amplitude may be caused by dissimilarities in implementations of wave kinematics, or slight differences originating in the modelling of the support structure.